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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64ac3f4831c8fdbd7eb2c36dc3ae8b6c66f4ee34f4f6316cd3c18acfec52f3f2' 
  AND token = 'fM8hZjI4MyPJkr7ecyCNteqINikZx57J02FX1lHv130=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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