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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdbc7cb7260901831e6b6702a00eef3ccdd0c84406efa7f136af47e6e1a58b93' 
  AND token = 'HqGV3gt+X0ZjAe67lHz0rClLl09mW5nVHknm8hqtHgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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