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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '229d3c0c365fcb2ccf79335fbd5ab81a1cd6a2d7632a2698d56da9d44d69fc0a' 
  AND token = 'AScuu+YeX2zR8w9xZX97HBRd0UqhZkKaPUBV7CyEn8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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