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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc34b1aaf1751d04f2d448271732f67bc5a4422db0727fbdd1233ea0a3ecae76' 
  AND token = 'vyLTau7brBGp7u+0sm/y0OrVll8Q7LMrYbxy05CINh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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