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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0021dad6fd50152cbe7130587fadf160619bf2c88064b2f99df74844e64e9cc5' 
  AND token = '5F3Qn9sZSu9HkoroM97s/yHpPNxgXK2W2Q9H2yhWe+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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