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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a0e1b02e0d0bafd8f8026376f07ccdd4f02f1ce4c69fcaf4d36c44c10f918d7' 
  AND token = 'wQgj9gwYF6zIJqUMp0Pkk6HohRW3q215vtCjuguCtf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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