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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3d937faa51b0812ba2d89df2d5ab65440ef37907b0974dd3dfc2d388ba23871' 
  AND token = 'VH9owzFORFb8dax9ZMX8B8IUvlC+KGzQlev+TApTxXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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