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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faf42adc8596c72bac5940d5184e5749817fcd299d83b8edca51a22db6cfc4cc' 
  AND token = 'M1MEP+Hst3Uvi2Ituhf+mF5OMN8CrLzpGDeEFGNVHO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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