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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2958005fd9a64cb2939c5c24950605f01832862bf175be9985e9c92360720f5e' 
  AND token = 'lul/p0I4Tu7y9qPB5wB+ft9pm5JPsl63vtO6SgyVzxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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