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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0479350ada397fbf9a03cfa7973af3ab2ac179f0047bf87edb61355e62621e6' 
  AND token = 'b83+ss40iGaOYXzazxniEfhKC8dEoA51WMw4siKFSSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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