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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5039fc0b7ddf09b7633240c47eb42a62e696cf9fa768b9c205ebee1f39ae38e' 
  AND token = '1Zc4awsk1SlR6W/O/Vf/peZ0VPgAfMsqcmdRto6T8dQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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