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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abee15412fa64c4c5d4bcabeb52304a18efa830c79e14994fc724dd51306fdbe' 
  AND token = 'hPaaaxl5B9Op3j2qeBMJz93UAuD1H2DntaOITCkprjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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