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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e2049e2bd3ac190c14d913a2c6f872afc61299db4e0df03b56c20f8819e900c' 
  AND token = '/E9MAS30f6b8bbvYIbKfUnjyOQb3VwDdeROP4C8uVlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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