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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ae5abf8ea8767162609f1847a1ed344c79312d39508c854607663c668ec8c64' 
  AND token = 'fvvQB9o68KA8QZP7jyD6gKuk5IY1v+kDanmvPPA0T7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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