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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38f51f63fa6b03d37a2f8db1564442339b28dae4cee48f8fda9ec3d53725cd5a' 
  AND token = 'E8IcIx4lfXDMLqfJKXy3pwM3CWcciGwNc69ybiknr+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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