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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccc617c7143b63b49fc1c0ea11945d9367d9d231a52c997a521c572c6852e47a' 
  AND token = 'hviucTyLmPjm8io7pISLliMC6z8oXxJS0kBLu0Lu5nY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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