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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac500b9343352128ab114fef1cb578e59e6e75e3b1d74b9e8a91cc604289304e' 
  AND token = 'tn9yLHWQZQ/H7H9qnBc263/+6etBd0N1R0Q6HaMyDMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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