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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0040a5bd523264523eacb5a5fe1a1dc4ab19c0018d7288666c14314e12da6843' 
  AND token = '/G8SFi03abtfBSwab5l/Djc3dAJEKTC6v7Rc1aaQIG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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