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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12466cb69bf9502f7414b7c5d02a8d8b4cdee2c8b0465656d397f5df9633671f' 
  AND token = 'u5TK+7jRdFHKU8g34Jzyxy8ha90aUcaj03oos9NrHc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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