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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86c9616b415d8d4937ac6ccead71245f63d747bc16299ad9d00343bbe95f7506' 
  AND token = 'ae0g9mG3zs3FxUOrM44DwvILU5KCtObYZckkulNYg/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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