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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94c3b05ceec27bcb72a2f5db3778f816045c7e4a3c8043aa7fb4783d726b7d9f' 
  AND token = 'MBJEyftUaRMYo8W3/T8xlhCaeitwHMVGX1qG13dTzhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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