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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '511eddefb28865271b7b6368764228cb3ddd05293e9bc9844774729e241ee7d4' 
  AND token = '5Cqh4f+cgr7LoDh6ysLBHZQsJzMAijN160k3INQBsyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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