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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd32dc4b6946e43a6d3a990764f57531654222959e53bf4ca93c0e897ea6f171' 
  AND token = '2rMaRHSmwVJjbu1b69gd/nCfLWmBOD9leasblLl4teY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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