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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98d812cdb7c5aec942e87f1c688d59051ebd63011b822c6b0199e2d34bea7f18' 
  AND token = 'vaWcx3LO8I9sP+xWStX8fa/mLxisQcEVoNrPgp3vvGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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