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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '053f2711820aa2a3deb65a358ad251fb396d9cd5ace6715f1fd347d34e2d7d7b' 
  AND token = '/uKpykP0CX8PsiSGob+iA6oPHwF9K8NGgAeH3YGakFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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