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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee6831a4e555e9d69a67816ef7f184fe4a7302591a8e96dbe075ebe018065b78' 
  AND token = 'sMJl8ZzUq73st3lmp7x6DZe7yPN+i6AGF8lcOrL9an0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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