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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73dd3574c8e87b2b4edec10143ff381805614bc90081f829ca1db1eb62ec6e06' 
  AND token = '00tbtwUHjAFI/qSa/d9Svo7hkkdH17kOCDJ2gKhcxpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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