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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d5991d9456cab652f56fe4aa95de946bf732fb89c4b2c15d1755f275233172d' 
  AND token = 'Akco7GxScq1OqrPLuuXISWg8TR5BrW7efMtuIUNTD8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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