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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c16ee1da7fc947e80874d202efc875b8c9d2801ebdb5b5f9e2aa89c6e9cb54c1' 
  AND token = 'Sf7G0tjzpt//J/jW3X/3LQ7W/vE+A5z7cMc79IIyg40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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