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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62fd2e61c0d96e23cf40914348dc32cccd955294b9763d0c7bcd31da5cfe2f35' 
  AND token = 'm66CNu5+ud5niNQoWeSERf9W+UBPjEv1i+N3iyoHmhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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