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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3273421feaf5527b3aa254617497a94ae6f519989c9bf1ff4198c178f391d18b' 
  AND token = 'putLbysKpEB7+D3t23hM+0MBniQxp9nygqf/ebAT2iI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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