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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56c073e34232a2165952d6cd8eba3a7ff2a1142dcf935882324a0d07a5bc09c5' 
  AND token = 'w7uDhdheVai117vL7Qn4g6axC1Kl6iwJ/7JM5dY/tKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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