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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58184d8e61ed7e0030c86cc1eb028454031d346ecc63326520fcd10938eed3b5' 
  AND token = 'FDn1sLko4E/LtXm/s+JlNZP1jgdHahOjyyJtcJo01KY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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