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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bff3127d8cb7f211706a403725e333075b9a5c7ccbd40ba8001481db316176b' 
  AND token = 'Nb6Ya2a9ykwuf2CwZt2DS3OzQN9JiMZULoQTTP1OMO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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