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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '694e0bb7faf487dbf22d2a3e05d005769c831087adb1d40c536f3e6bd525ba6c' 
  AND token = 'JtJDaZyJ+yDGf24fSjK4QsT/ZOkbkvwLcFxXDv14kSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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