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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6079f548e84c93ba971bd33f4290fe1370aa9596e4ea751fe3087da3ea7d7251' 
  AND token = 'PoNSDtHubyJRKD7pynF8fNmLj62n8hluwss1IrxbnM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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