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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b72b2e23e04ed7dea2fa01bd3bfe87d064c6e160f84dbd3f873fa3149e4929a' 
  AND token = 'Gua7u5a6RXX4BFFQvl3a/NLa9qzOMjwG9/vkqel7OUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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