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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9af54230fc6b4163496e5f7898137517bd921e4ce0d4ab05f0543d079a0a697b' 
  AND token = 'JJ6HnEhY9wh1173v2q5D01OlsGtvM/LecJ1C8zut4vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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