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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '677ded7f63218b860f668bfc0f0eba0e860016413a0401d059640901c531c0a4' 
  AND token = 'YF3qUPRm3Vs4kPI15srd0EUKLp8ScJmPl+xc4nxP3p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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