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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f92a6424dd23f2c43e82a7a539ea67b235944cab6c23a13745a8bd8a4f9fb00' 
  AND token = 'YJ01ja+jeaz4aUSU/96RD3ccWwU+CNXEkX4lBU7bQ9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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