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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25204174737824ad87e95cb46a17b07c0c1293982274f66428e9fe0a1bc16ed4' 
  AND token = '3lP83kFgVf4YT84hKwuIjpg1+82n+hdsyJtMyhSour4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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