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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f4bccc38faf075af94f05df5293bf0778e969e6a86bee7c9b7cb1071fff205e' 
  AND token = 'f8/zPVsTHoHEYmJZIph9RcSrEGSXq33mD8IRsjX3/Ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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