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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65a170fd685a7f2ef6e1d6d0614c16d33a3397f3fc6cbe61e5529c7cc8ae6004' 
  AND token = 'jgxArxggTdkT3pmlcnueACF6SJrf6fjHAnI06/jBpqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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