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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '208b47d5e1c066f3e86e8de2f4c8a6e02f1dcb8964fd34892426fbdb79c934d7' 
  AND token = 'ZZgpdLVHHJlJCJPIRmi2ksXaze70D8H4S5gYSvp3rkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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