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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb654cf9faa10717721bff62b26a9c97d44fc570ed517fa51ed0ecd49ce2b797' 
  AND token = 'HjtkLdkw4aUH1MXue38cYlQPT5mNFNoSZjNaX4UbM/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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