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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d9fc159f3dfc3e5f41cc3c3ceac8c7b7fcc646817e56f367fe95183a92fe3e0' 
  AND token = 'DagT6x7M+HG2H6byQcpjPafOP2kELfdVR+E+WnZA1Lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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