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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '631398f94e5b5fb63ce99f2fc0d3d41ad715588365edc56684cd4273e70e0a06' 
  AND token = 'VBNM+oaDcJhEIVTmRKkaMesu+w59O295Vo/G99ZcLHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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