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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b84ba60b050c14f02083355bc3bb4cc518d8081b73f9caa210e21881dd9d22d6' 
  AND token = 'MHmzG1Mkpv7N0jGfEc86IPEOuejBGSeH+fD+YMSslKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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