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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b18a1a7ffeea189cf97a23b128963c2a3b381c1d2bde742aeff4d361f5967c3' 
  AND token = 'ZaOLPZCCFYD28tuZvrDLLPXiNpnsXw14gJFin83Wk9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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