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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96e119f12f40363de72c0fc48f26be6899757c26343fb5de77f5db6c3d32855f' 
  AND token = 'ng0+mHZo1rW4D14Jb89Od2RxW6HeiK9prdh99imIBCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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