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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '076d6732c2cacdfa0716d0f14a7d6c3ad26aa0fc597c9b50796f833b4f8d8437' 
  AND token = 'C6M5HrxeXbpEBEM6OUnIHMx41304Mk1jyGIZJk5jKHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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