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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c10e6dd75ef5a88a15c1a0056aaab5955323794780e64606f6bb698a4faf899' 
  AND token = '1qLUNZ5bGuvm4GW8K/VDNsEW3+WFv0lYaaj/a4/yHEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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