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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1a8b6fe8ea49c6ece6498d6b9871f75403d9023630eb3e9767c410a7909b4b1' 
  AND token = 'Iryc5+qXTCnJ5UWeKA6uEio6x7T2cJkZqXys6CPR5N4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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