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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87ee5522aab570ea374ad18c21f09823cb0c23d5d5f8dad58ed46e3574c99768' 
  AND token = '2s1givt4S8hxE8B9ANQ+dEp6KTIc0INYippV5B2gnZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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