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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09f9c5c0be40ecc6110411f1d66eb34b0b735d238a6cecdb761ce52bdc611761' 
  AND token = 'SUHeT1a0JqBjA77UVp9dvfm5xaeTFFxL9pH9k52BqGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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