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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4b4dd49faaf56bce359f8ef4eaa0744aa6e4cb1a31860e459076db10ba5d91a' 
  AND token = '9IDFqvLNt1h71o2qyDEzhWpyJPw3XpBwc90FE3uXNiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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