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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca0f32294cfea94c7e276ea9b189531322993ac583cd9cc06dc40da43fa4345e' 
  AND token = 'b4gb1zHxgIGLQhe3DbS2VtSJ3FrA16WysaeXD5I1k8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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