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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7098c6d4e7b69009dc000041b766796348c2dae21253dc4c1c6b51f221aad60a' 
  AND token = 's1WGIU6WNN2aNffMGzah1V+nvu1jUnO/AIj2TRhEIqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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