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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bde0d54d753b00e7e7cea96ac0a86d8f8a112b9ab7f6ff1b05ca7bb98628d02c' 
  AND token = 'MdJjAsAROvUcvNlLnOGZ7Ot5+cy/ba1HgD6NDiDc9gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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