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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5fd5825d3d309da8fffb67ef94a7e5b28d2db714f589c9b96947f63fda0d530' 
  AND token = 'ia91WAmi0IupIw+YxAxcE2NrV22G15hhKS7oYDwh4lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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