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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58765f8af047620710748b1264e6d17f4a383217c1eb2329d1ddf23f9b74f90f' 
  AND token = 'bP28mZszA5WcUDRYO44liA0dLdPz7NxOPVsn6Kl+ii0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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