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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '680437e30f27097ffce97c17aeca5dd554ddcca56d1ba5a324bec2047376b223' 
  AND token = 'ToXSMrCqGd71iV+LK3Z9Pt+Yq6IIt3hzR6EXJavMGKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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