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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af5760ca0fbb9c90fec13d419ae89e22f3e4da8c79b99eb3074c81490d874e51' 
  AND token = 'EqGaoemX5/wuWJUU4OjvxNdJbv/qCExTEOp9+ffmErA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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