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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63fad1acf9baa381b60c78980718d24873a1f4ded185eea8549fe3dd97a9eddc' 
  AND token = '64/CT+2V2TMZjD7THk/vScQYijWsxcAzZ8M/RbAeDE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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