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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4595485059cc41739ee49d81a729e7502f3649f5bd74a88f5d6efae9699394f' 
  AND token = '01PImnZ8vXDJpOuJkMJXd1w2oA4jL//7G7C3VhR5O0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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