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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac2fc09fa8c2d3b6a2a19cb44e6bf34b96ed199024da6b259a6e63c84423e0fa' 
  AND token = 'jPdazWn9vVT1fNl3uIgO4SkjooVqBqdVSNWTH43g3HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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