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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5d782f1e59dd8142b864e505debb19f8dd07e239345f5247266f68709a52ce5' 
  AND token = 'RHX0YhnNND0NabRStTXc/B3HGjtqilthJoIXNPQHJ8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}